class_docstr: Benchmarks on common operations on collections of datasets using datalad API
code: def time_diff(self):
      self.ds.diff(fr="HEAD^")
  
imports: from os.path import join
  from datalad.api import create
  from datalad.api import create_test_dataset
  from datalad.api import install
  from datalad.api import ls
  from datalad.api import drop
  from .common import SampleSuperDatasetBenchmarks, SuprocBenchmarks
label_desc: Use image node_id 13 for calling the supers obj's underlying member method code with example usage: obj.time_diff() without return types